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Old 17th February 2004, 01:00 AM   #21
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Every professional video projector is projecting off axis for easy floor or ceiling mounting.

But this is not made by tilting the projector and correcting the misaligned picture by keystone. It is made by putting the lens off axis by some offset.

This is also called lens shift.

The projector then stays in the horizontal position.

Keystone should only be used if it is not possible to install the projector in a horizontal position or if the screen is not absolutely vertical.
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Old 17th February 2004, 01:42 AM   #22
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Quote:
But this is not made by tilting the projector and correcting the misaligned picture by keystone. It is made by putting the lens off axis by some offset.
My projector had a lens offset and a up and down to move the unit up and down aswell as a keystone. The lens was off axis by default so u didnt have to tilt the projector as high.

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It is made by putting the lens off axis by some offset
And this offset is done with a frensel cut offset with an offset mirror to guide the light through the lens

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Old 20th August 2005, 09:49 PM   #23
dracul is offline dracul  Brazil
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ace ,

can you explain this a little better. speak simple english.
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Old 2nd May 2013, 11:40 PM   #24
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First of all, sorry for waking up an old topic.

This is my idea of keystoning, as what I'm reading from the posts above it should work, can anyone confirm this?

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